package org.jeecgframework.core.util;

import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

public class IpUtil {
	/**
	 * 获取登录用户IP地址
	 * 
	 * @param request
	 * @return
	 */
	public static String getIpAddr(HttpServletRequest request) {
		// String ip = request.getHeader("x-forwarded-for");
		// if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
		// ip = request.getHeader("Proxy-Client-IP");
		// }
		// if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
		// ip = request.getHeader("WL-Proxy-Client-IP");
		// }
		// if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
		// ip = request.getRemoteAddr();
		// }
		// if (ip.equals("0:0:0:0:0:0:0:1")) {
		// ip = "本地";
		// }

		String ip = null;

		// X-Forwarded-For：Squid 服务代理
		String ipAddresses = request.getHeader("X-Forwarded-For");

		if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
			// Proxy-Client-IP：apache 服务代理
			ipAddresses = request.getHeader("Proxy-Client-IP");
		}

		if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
			// WL-Proxy-Client-IP：weblogic 服务代理
			ipAddresses = request.getHeader("WL-Proxy-Client-IP");
		}

		if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
			// HTTP_CLIENT_IP：有些代理服务器
			ipAddresses = request.getHeader("HTTP_CLIENT_IP");
		}

		if (ipAddresses == null || ipAddresses.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
			// X-Real-IP：nginx服务代理
			ipAddresses = request.getHeader("X-Real-IP");
		}

		// 有些网络通过多层代理，那么获取到的ip就会有多个，一般都是通过逗号（,）分割开来，并且第一个ip为客户端的真实IP
		if (ipAddresses != null && ipAddresses.length() != 0) {
			ip = ipAddresses.split(",")[0];
		}

		// 还是不能获取到，最后再通过request.getRemoteAddr();获取
		if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ipAddresses)) {
			ip = request.getRemoteAddr();
		}
		return ip;
	}

	/**
	 * 获取本地IP列表（针对多网卡情况）
	 *
	 * @return
	 */
	public static List<String> getLocalIPList() {
		List<String> ipList = new ArrayList<String>();
		try {
			Enumeration<NetworkInterface> networkInterfaces = NetworkInterface.getNetworkInterfaces();
			NetworkInterface networkInterface;
			Enumeration<InetAddress> inetAddresses;
			InetAddress inetAddress;
			String ip;
			while (networkInterfaces.hasMoreElements()) {
				networkInterface = networkInterfaces.nextElement();
				inetAddresses = networkInterface.getInetAddresses();
				while (inetAddresses.hasMoreElements()) {
					inetAddress = inetAddresses.nextElement();
					if (inetAddress != null && inetAddress instanceof Inet4Address) { // IPV4
						ip = inetAddress.getHostAddress();
						ipList.add(ip);
						// System.out.println("获取本机IP："+ip);
					}
				}
			}
		} catch (SocketException e) {
			e.printStackTrace();
		}
		return ipList;
	}

}
